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Formation mechanism and stability of the phase in the interface of tungsten carbide particles reinforced iron matrix composites: First principles calculations and experiments

Published online by Cambridge University Press:  29 July 2016

Zulai Li ,
He Wei ,
Quan Shan ,
Yehua Jiang ,
Rong Zhou  and
Jing Feng
Zulai Li*
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, People's Republic of China
He Wei
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, People's Republic of China
Quan Shan
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, People's Republic of China
Yehua Jiang
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, People's Republic of China
Rong Zhou
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, People's Republic of China
Jing Feng
Affiliation:
School of Engineering and Applied Science, Harvard University, Cambridge, MA, 02138, USA
*
a) Address all correspondence to this author. e-mail: lizulai@126.com
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Abstract

To study the formation mechanism and stability of the phase in the interface of tungsten carbide particles reinforced iron matrix composites, the composites were fabricated by spark plasma sintering (SPS) technique and combined with first-principles calculation. It was found that Fe3W3C compound was stable from the perspective of both thermodynamics and mechanical properties based on our calculations. Interfacial reaction product of tungsten carbide particles reinforced iron matrix composites was M6C. Experimental results indicated that the samples prepared by SPS did not appear interfacial reaction zone, while, interfacial reaction zone appeared for the remelted samples. With the increasing remelting temperature, the width of the interface reaction zone increased because the mutual diffusion occurred at the interface between tungsten carbide particles and matrix. Its formation mechanism was 3Fe + 3/2W2C → Fe3W3C + 1/2C. Our research might provide a theoretical guidance in controlling the interface of tungsten carbide particles reinforced iron matrix composites.

Keywords

compositeFediffusion
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 16 , 29 August 2016 , pp. 2376 - 2383
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Copyright
Copyright © Materials Research Society 2016 

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